Answers

Add 20/63 and 40/70

20/63 + 40/70 is 8/9.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 70 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 63 × 10 = 630,
   20/63 = 20 × 10/63 × 10 = 200/630
3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
   40/70 = 40 × 9/70 × 9 = 360/630
4. Add the two like fractions:
   200/630 + 360/630 = 200 + 360/630 = 560/630
5. 560/630 simplified gives 8/9
6. So, 20/63 + 40/70 = 8/9

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